题目内容
用简便方法计算.
715+198
×
+
÷19 15-2.375-3.625.
715+198
| 18 |
| 19 |
| 8 |
| 9 |
| 8 |
| 9 |
(1)715+198,
=715+(200-2),
=715+200-2,
=915-2,
=913;
(2)
×
+
÷19,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)15-2.375-3.625,
=15-(2.375+3.625),
=15-6,
=9.
=715+(200-2),
=715+200-2,
=915-2,
=913;
(2)
| 18 |
| 19 |
| 8 |
| 9 |
| 8 |
| 9 |
=
| 18 |
| 19 |
| 8 |
| 9 |
| 8 |
| 9 |
| 1 |
| 19 |
=(
| 18 |
| 19 |
| 1 |
| 19 |
| 8 |
| 9 |
=1×
| 8 |
| 9 |
=
| 8 |
| 9 |
(3)15-2.375-3.625,
=15-(2.375+3.625),
=15-6,
=9.
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